Remote Photoplethysmography-Triggered Signal Averaging for Non-Contact Heart Sound Measurement

Area of Science:

• Biomedical Engineering
• Cardiology
• Signal Processing

Background:

• Growing need for early cardiovascular disease detection.
• Current heart sound monitoring methods may be invasive or limited.
• Requirement for non-contact, accurate heart sound assessment.

Purpose of the Study:

• To propose and evaluate a novel non-contact heart sound measurement approach.
• To utilize remote photoplethysmography (rPPG) for triggering signal averaging.
• To enhance heart sound detection while reducing ambient noise.

Main Methods:

• Development of a signal averaging technique triggered by rPPG peaks.
• rPPG signal acquisition for heart rate variability estimation.
• Feasibility assessment of the proposed non-contact measurement method.

Main Results:

• Demonstrated feasibility of non-contact heart sound measurement using rPPG triggers.
• rPPG-triggered signal averaging effectively emphasizes heart sounds.
• Identified an accuracy requirement of ~0.04s (std dev of R-R interval error) for triggers.

Conclusions:

• The proposed rPPG-triggered signal averaging is a viable method for non-contact heart sound measurement.
• This technique holds potential for remote and continuous cardiovascular health monitoring.
• Accurate R-R interval estimation is crucial for the efficacy of this approach.